I got an F on a task, what should I do?

Anonymous
I honestly don't even think it's my fault. Basically, for PE, we had to turn in this graph from our HR monitor. Mine was some sort of dotted graph and I got an F because it wasn't a line graph from the app Zones. But however, the teacher never specified in his instruction that we needed to create the graph on Zones, or that it HAD to be a line graph. So I don't know what I should do, I never got an F before, and my parents are going to kill me.
I got an F on a task, what should I do?
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